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PW0-100 Wireless LAN Administration, Certified Wireless Network Administrator (CWNA) Questions 231–235 (page: 48)

Updated On: 10-Feb-2026

Which of the following describe differences in the encryption techniques of HomeRF and 802.11b?

  1. HomeRF uses DSSS and 802.11b uses FHSS technology.
  2. HomeRF uses wideband FHSS whereas 802.11b uses narrowband FHSS.
  3. The Initialization Vector (IV) of 802.11b is 24-bit, whereas the IV of HomeRF is 32-bit.
  4. HomeRF specifies how IVs are chosen, how IVs are chosen in the 802.11b is not specified.

Answer(s): C,D

Explanation:

According to the study guide (chapter 6, page 227), HomeRF uses a 32-bit IV and also specifies how IVs should be chosen. Conversely, 802.11 uses a 24 bit IV and does not specify how the IV is selected. Therefore, the answer should be C, D.



In a FHSS system, how much of the 2.4 GHz ISM band spectrum is used?

  1. 20 MHz
  2. 22 MHz
  3. 83.5 MHz
  4. 100 MHZ

Answer(s): C



In the wireless LAN client utility software, which of the following functions may be configured? Select all that apply.

  1. Modulation type
  2. Connection speed
  3. Continuous Aware Mode
  4. Spanning Tree Protocol
  5. Bit ordering

Answer(s): B,C



Which option may be used as a wireless LAN security feature?

  1. Probe request frames
  2. Protocol filters
  3. Active scanning keys
  4. ATIM windows

Answer(s): B

Explanation:

Protocol filters (IP protocol, IP port, and Ether type) prevent or allow the use of specific protocols through the bridge's Ethernet and radio ports. You can set up individual protocol filters or sets of filters. You can filter protocols for wireless client devices, users on the wired LAN, or both. For example, an SNMP filter on the bridge's radio port prevents SNMP access through the radio but does not block SNMP access from the wired LAN.
IP address and MAC address filters allow or disallow the forwarding of unicast and multicast packets either sent from or addressed to specific IP or MAC addresses. You can create a filter that passes traffic to all addresses except those you specify, or you can create a filter that blocks traffic to all addresses except those you specify.
Reference:
http://www.cisco.com/univercd/cc/td/doc/product/wireless/aero1400/br1410/pscg15/p15filt.htm



Power over Ethernet (PoE) may be delivered to a wireless bridge by which of the following mechanisms? Select two.

  1. DC Voltage injector
  2. AC Line voltage injector
  3. Active Ethernet switch
  4. RF Injector module
  5. Over 2.4 GHz frequencies

Answer(s): A,C



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